I have blonde hair and tried dying it with temporary dye brown, and it came out a strange brownish-orange colour. (I ended up dying it 3-4 times to try and make it darker and it made no difference!) so I don't know how successful wash-in-wash-out dye would be. Especially on quite dark hair like yours, but personally I wouldn't recommend it as you will probably not get the colour to be as bright, vibrant or correct as you want.

You would probably be better getting a wig as you can control all these factors without worrying about messing your hair up.

__________________I'm going to slash your pillow and tear out all the stuffing with a motorbike made of jelly.

You would probably be better getting a wig as you can control all these factors without worrying about messing your hair up.

Hey, I've used wigs in the past, and may do so again but find them really frustrating as they often won't sit right, or stay in the style you put them in, but will keep as an option certainly. thanks for the advice

You would probably be better getting a wig as you can control all these factors without worrying about messing your hair up.

Hey, I've used wigs in the past, and may do so again but find them really frustrating as they often won't sit right, or stay in the style you put them in, but will keep as an option certainly. thanks for the advice

Personally I find wigs a more convenient option. Also they would save alot of time on the day while getting ready, even if they do require a little last minute brush. I find that hidden hair-grips are great at keeping wigs still and secure as well as keeping my hair well hidden

I don't know much about products that changes hair colour directly but I tried hair mascara. Unless alot is applied it wont show much (my hair is chestnut brown) and like spray on dye it feels kinda stiff.

Wigs take a little practice, but I find if you use enough hairspray/gel, as well as hairpins (as said above with hidden hairpins or clips) they are often a lot easier and better in terms of staying in the shape for more than one wear.

As said, you can pretty much take them out of the box, put them on your head and as long as you make use of a couple of pins and a wig cap (I've used a pair of tights and as little as 4 hairpins to have it stay on my head all day!)

Plus if you decide to rewear the cosplay you don't have to worry about styling/colouring your hair again.

__________________I'm going to slash your pillow and tear out all the stuffing with a motorbike made of jelly.